package org.imaginedays.androidall.ui;

import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.imaginedays.androidall.R;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Environment;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

/**
 * @author Sodino sodinoopen@hotmail.com
 * @since 2011年3月1日13时00分41秒
 * */
@SuppressLint("NewApi")
public class FetchAPKIconAct extends Activity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.fetch_apk_act);
		String archiveFilePath = Environment.getExternalStoragePublicDirectory(
				Environment.DIRECTORY_DOWNLOADS).toString()
				+ "/" + "cc.apk";

		showUninstallAPKIcon(archiveFilePath);
		// getUninatllApkInfo(this, archiveFilePath);
	}

	/** 网传的方法,但获取不成功 */
	public void getUninatllApkInfo(Context context, String archiveFilePath) {
		PackageManager pm = context.getPackageManager();
		PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath,
				PackageManager.GET_ACTIVITIES);
		if (info != null) {
			ApplicationInfo appInfo = info.applicationInfo;
			Drawable icon = pm.getApplicationIcon(appInfo);
			ImageView image = (ImageView) findViewById(R.id.apkIconByTradition);
			image.setVisibility(View.VISIBLE);
			image.setImageDrawable(icon);
		}
	}

	//
	private void showUninstallAPKIcon(String apkPath) {
		String PATH_PackageParser = "android.content.pm.PackageParser";
		String PATH_AssetManager = "android.content.res.AssetManager";
		try {
			// apk包的文件路径
			// 这是一个Package 解释器, 是隐藏的
			// 构造函数的参数只有一个, apk文件的路径
			// PackageParser packageParser = new PackageParser(apkPath);
			Class pkgParserCls = Class.forName(PATH_PackageParser);
			Class[] typeArgs = new Class[1];
			typeArgs[0] = String.class;
			Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
			Object[] valueArgs = new Object[1];
			valueArgs[0] = apkPath;
			Object pkgParser = pkgParserCt.newInstance(valueArgs);
			Log.d("ANDROID_LAB", "pkgParser:" + pkgParser.toString());
			// 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
			DisplayMetrics metrics = new DisplayMetrics();
			metrics.setToDefaults();
			// PackageParser.Package mPkgInfo = packageParser.parsePackage(new
			// File(apkPath), apkPath,
			// metrics, 0);
			typeArgs = new Class[4];
			typeArgs[0] = File.class;
			typeArgs[1] = String.class;
			typeArgs[2] = DisplayMetrics.class;
			typeArgs[3] = Integer.TYPE;
			Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod(
					"parsePackage", typeArgs);
			valueArgs = new Object[4];
			valueArgs[0] = new File(apkPath);
			valueArgs[1] = apkPath;
			valueArgs[2] = metrics;
			valueArgs[3] = 0;
			Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,
					valueArgs);
			if (pkgParserPkg != null) {

				// 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
				// ApplicationInfo info = mPkgInfo.applicationInfo;
				Field appInfoFld = pkgParserPkg.getClass().getDeclaredField(
						"applicationInfo");
				ApplicationInfo info = (ApplicationInfo) appInfoFld
						.get(pkgParserPkg);
				// uid 输出为"-1"，原因是未安装，系统未分配其Uid。
				Log.d("ANDROID_LAB", "pkg:" + info.packageName + " uid="
						+ info.uid);
				// Resources pRes = getResources();
				// AssetManager assmgr = new AssetManager();
				// assmgr.addAssetPath(apkPath);
				// Resources res = new Resources(assmgr,
				// pRes.getDisplayMetrics(),
				// pRes.getConfiguration());
				Class assetMagCls = Class.forName(PATH_AssetManager);
				Constructor assetMagCt = assetMagCls
						.getConstructor((Class[]) null);
				Object assetMag = assetMagCt.newInstance((Object[]) null);
				typeArgs = new Class[1];
				typeArgs[0] = String.class;
				Method assetMag_addAssetPathMtd = assetMagCls
						.getDeclaredMethod("addAssetPath", typeArgs);
				valueArgs = new Object[1];
				valueArgs[0] = apkPath;
				assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
				Resources res = getResources();
				typeArgs = new Class[3];
				typeArgs[0] = assetMag.getClass();
				typeArgs[1] = res.getDisplayMetrics().getClass();
				typeArgs[2] = res.getConfiguration().getClass();
				Constructor resCt = Resources.class.getConstructor(typeArgs);
				valueArgs = new Object[3];
				valueArgs[0] = assetMag;
				valueArgs[1] = res.getDisplayMetrics();
				valueArgs[2] = res.getConfiguration();
				res = (Resources) resCt.newInstance(valueArgs);
				CharSequence label = null;
				if (info.labelRes != 0) {
					label = res.getText(info.labelRes);
				}
				// if (label == null) {
				// label = (info.nonLocalizedLabel != null) ?
				// info.nonLocalizedLabel
				// : info.packageName;
				// }
				Log.d("ANDROID_LAB", "label=" + label);
				// 这里就是读取一个apk程序的图标
				if (info.icon != 0) {
					Drawable icon = res.getDrawable(info.icon);
					ImageView image = (ImageView) findViewById(R.id.apkIconBySodino);
					image.setVisibility(View.VISIBLE);
					image.setImageDrawable(icon);
				}
			} else {
				// TODO 解析安装包失败 重新下载
				Toast.makeText(FetchAPKIconAct.this, "解析安装包失败!重新下载",
						Toast.LENGTH_LONG).show();
				Log.e("FetchAPK", "ccc");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}